The "cookie law" applies to every information that allows identifying the user which is not strictly necessary for the purposes of the service. Cookie to say "

The "cookie law" applies to every information that allows identifying the user which is not strictly necessary for the purposes of the service. Cookie to say "has clicked no"? okay. Login cookie? okay. Cookie to track the user? not okay. Local storage to track the user? not okay. Tracking the user based on magic? not okay.